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According to Radar Online, the children will get to celebrate their birthday by seeing both of their parents today. Kate reportedly OK'd Jon to stop by and visit even though Monday wasn't one of the days he was originally scheduled to spend time with the kids.

As for Kate's feelings about today's big day, Kate hit her official blog to share her feelings about the six children, turning six.

"My six youngest children are turning six in only a few days! I'm not really sure how that happened so quickly but it makes me happy but, also … well … sad!" she wrote last week.

"To make my sadness worse, their birthday falls on the same day of the week that they were born — a Monday! And also, like the year they were born, it's the day after Mother's Day!" Kate wrote on her blog last Thursday. "I barely have to start thinking about that day and, yep, hold on, I have to grab a tissue. I gotta catch these tears before they smear my eye makeup!"

Kate went on to share what she called six "miracles" that came with her family becoming a "Plus 8."

"It always amazes me how unique and special they each are alone. But when they are all together, they're a perfectly blended garden of wild flowers!" she noted.

The mom and upcoming star of "Twist of Kate," wrote that having the babies, who were delivered via C-section, was very painful.

"As each of my tiny peewees were pulled out I felt pain and prodding and felt totally out of control (not good, if you know anything about me!), but the miracle that made it all bearable was hearing six healthy tiny cries as my six babies took their first breath of air and were welcomed by their first-ever crowd of fans," she wrote. "Although I was nothing but a fillet on a table nearby, it goes without saying that I was their biggest fan (and still am … and will always be!)"

The reality star wrapped things up by noting she looks forward to celebrating more big days with the sextuplets.

"What a miracle to be the mom of six miracles turning six! I've enjoyed every year … I can't wait to enjoy many more!" she added.